//格式化xml,来自网络http://www.cnblogs.com/skywang/articles/2051052.html
    function formatXml(text)
    {
        //去掉多余的空格
        text = '\n' + text.replace(/(<\w+)(\s.*?>)/g,function($0, name, props)
        {
            return name+" " + props.replace(/(\w+=)/g,"$1").trim();
        }).replace(/>\s*?</g,">\n<");
        
        //把注释编码
        text = text.replace(/\n/g,'\r').replace(/<!--(.+?)-->/g,function($0, text)
        {
            var ret = '<!--' + escape(text) + '-->';
            //alert(ret);
            return ret;
        }).replace(/\r/g,'\n');
        
        //调整格式
        var rgx = /\n(<(([^\?]).+?)(?:\s|\s*?>|\s*?(\/)>)(?:.*?(?:(?:(\/)>)|(?:<(\/)\2>)))?)/mg;
        var nodeStack = [];
        var output = text.replace(rgx,function($0,all,name,isBegin,isCloseFull1,isCloseFull2 ,isFull1,isFull2){
            var isClosed = (isCloseFull1 == '/') || (isCloseFull2 == '/' ) || (isFull1 == '/') || (isFull2 == '/');
            //alert([all,isClosed].join('='));
            var prefix = '';
            if(isBegin == '!')
            {
                prefix = getPrefix(nodeStack.length);
            }
            else 
            {
                if(isBegin != '/')
                {
                    prefix = getPrefix(nodeStack.length);
                    if(!isClosed)
                    {
                        nodeStack.push(name);
                    }
                }
                else
                {
                    nodeStack.pop();
                    prefix = getPrefix(nodeStack.length);
                }
            
            }
                var ret =  '\n' + prefix + all;
                return ret;
        });
        
        var prefixSpace = -1;
        var outputText = output.substring(1);
        //alert(outputText);
        
        //把注释还原并解码，调格式
        outputText = outputText.replace(/\n/g,'\r').replace(/(\s*)<!--(.+?)-->/g,function($0, prefix,  text)
        {
            //alert(['[',prefix,']=',prefix.length].join(''));
            if(prefix.charAt(0) == '\r')
                prefix = prefix.substring(1);
            text = unescape(text).replace(/\r/g,'\n');
            var ret = '\n' + prefix + '<!--' + text.replace(/^\s*/mg, prefix ) + '-->';
            //alert(ret);
            return ret;
        });
        
        return outputText.replace(/\s+$/g,'').replace(/\r/g,'\r\n');
    }
    function getPrefix(prefixIndex)
    {
        var span = '    ';
        var output = [];
        for(var i = 0 ; i < prefixIndex; ++i)
        {
            output.push(span);
        }
        
        return output.join('');
    }        